The US Department of Health and Human Services is issuing a declaration that allows the US Food and Drug Administration to issue Emergency Use Authorizations for animal drugs to treat or prevent infestations caused by the New World screwworm. This declaration applies only to drugs for animals.

NWS infests warm-blooded animals, including livestock, pets, wildlife, and, in rare cases, humans, causing severe tissue damage and sometimes death. The first human case of NWS, associated with travel, was announced in the US on Aug. 25, 2025, but HHS noted that the risk to human health in the US remains very low.

Despite the risk to human health in the United States remaining very low, the potential future threat to animal populations and the food supply chain requires proactive action. Although eradicated from North America and Central America decades ago, NWS has progressed north since 2022 and is now approaching the US border with Mexico. This parasite poses an emerging threat to livestock and food security, with potential impacts on both national security and animal health.

“Today we are taking decisive action to safeguard the nation’s food supply from this emerging threat,” said HHS Secretary Robert F. Kennedy Jr. “This authorization equips FDA to act quickly, limit the spread of New World Screwworm, and protect America’s livestock.”

Currently, there are no FDA-approved drugs for NWS in the United States. The FDA through an EUA can authorize the flexible, faster use of certain animal drug products that may be approved for other purposes, or available in other countries, but not formally approved for NWS in the US. This ensures veterinarians, farmers and animal health officials have timely access to the tools they need to protect pets, livestock and the nation’s food supply.

“Thank you to my friends and partners Secretary Kennedy and Commissioner Makary who are answering the call and supporting our aggressive plan to push back and ultimately defeat this devastating pest. This emergency use authorization is another tool we can use in the fight against New World Screwworm,” said Secretary of Agriculture Brooke Rollins. “Our cattle ranchers and livestock producers are relying on the Trump Administration to defend their livelihoods. Stopping this pest is a national security priority and we are linking arms across President Trump’s cabinet to defend our borders and push back this threat.”

“Our priority is to safeguard both animal health and the nation’s food supply,” said FDA Commissioner Marty Makary. “FDA is acting swiftly and responsibly to help ensure we have the necessary tools to prevent and control New World Screwworm, minimizing risks to agriculture and public health.”

FDA will provide future guidance to veterinarians and stakeholders on the appropriate use of any products authorized for emergency use and update the New World Screwworm: Information for Veterinarians page.

Source: HHS